AT89C51IC2-SLSIL Atmel, AT89C51IC2-SLSIL Datasheet - Page 27
AT89C51IC2-SLSIL
Manufacturer Part Number
AT89C51IC2-SLSIL
Description
IC 8051 MCU FLASH 32K 44PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51IC2-SLRIM.pdf
(147 pages)
Specifications of AT89C51IC2-SLSIL
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
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Part Number
Manufacturer
Quantity
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Expanded RAM
(XRAM)
Figure 8. Internal and External Data Memory Address
4301D–8051–02/08
0FFh or 3FFh
00
XRAM
The AT89C51IC2 provides additional Bytes of random access memory (RAM) space for
increased data parameter handling and high level language usage.
AT89C51IC2 devices have expanded RAM in external data space; maximum size and
location are described in Table 22.
Table 22. Expanded RAM
The AT89C51IC2 has internal data memory that is mapped into four separate
segments.
The four segments are:
1. The Lower 128 bytes of RAM (addresses 00h to 7Fh) are directly and indirectly
addressable.
2. The Upper 128 bytes of RAM (addresses 80h to FFh) are indirectly addressable only.
3. The Special Function Registers, SFRs, (addresses 80h to FFh) are directly address-
able only.
4. The expanded RAM bytes are indirectly accessed by MOVX instructions, and with the
EXTRAM bit cleared in the AUXR register (see Table 22)
The lower 128 bytes can be accessed by either direct or indirect addressing. The Upper
128 bytes can be accessed by indirect addressing only. The Upper 128 bytes occupy
the same address space as the SFR. That means they have the same address, but are
physically separate from SFR space.
When an instruction accesses an internal location above address 7Fh, the CPU knows
whether the access is to the upper 128 bytes of data RAM or to SFR space by the
addressing mode used in the instruction.
•
AT89C51IC2
Instructions that use direct addressing access SFR space. For example: MOV
0A0H, # data, accesses the SFR at location 0A0h (which is P2).
0FFh
80h
7Fh
00
indirect accesses
direct or indirect
128 bytes
128 bytes
accesses
Internal
Internal
Upper
Lower
Ram
Ram
XRAM size
1024
0FFh
80h
direct accesses
Function
Register
Special
00FFh up to 03FFh
Start
00h
0FFFFh
0000
Address
External
Memory
Data
End
3FFh
27
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